Just to clarify, I am referring to the tube flanges at the egr valve. I didn't specify that earlier. If you remove the entire air intake from the throttle body elbow right to the air box, you will have decent amount of room to get at it. The bolt heads might be 10MM but I can't remember. I unbolted the two bolts for the top flange. The one bolt closer to the engine is the one I broke and be careful with that one because the bolt hole is not open at the bottom so upon tightening it you could bottom it out and break it off. The other bolt hole is open at the bottom. I got the one bolt out and sheared the head off the other. Once I had that free, the gasket was stuck to the valve so I left it alone. I pulled the flange up the tube and out of my way and carefully pushed the tube toward the driver's side enough to see into the valve just a little bit and soaked the snot out of the inside. I also sprayed some on the valve assembly that you'll be able to see thru the notches in the case, between the valve body and the solenoid part of it. Its shiny silver in the center and is probably the shaft of the valve pintle.
My thought was that maybe some carbon was hanging up the valve enough every now and again so that it wasn't completely closing, and giving the high position reading on the sensor. Also to note, if any part of the egr valve goes bad, you're looking at an entire new one. The valve, solenoid and position sensor are one complete unit.
The name's Chris but the step-kids call me something much worse!
Favorite Quote: "A man's got to know his limitations."-Clint Eastwood as "Dirty" Harry Callahan in Magnum
Second favorite quote: "Another day, another drama."-Me (2006)
Third favorite quote: "I live a boring life. Its everyone in it that makes it interesting."-Me (2006)